Bug 1263469 P5 Add a wpt test case for EventSource. r=ehsan

testing/web-platform/tests/service-workers/service-worker/fetch-event.https.html

@@ -478,5 +478,55 @@ async_test(function(t) {
       .catch(unreached_rejection(t));
   }, 'Service Worker responds to fetch event with the correct cache types');
 
+async_test(function(t) {
+    var scope = 'resources/simple.html?eventsource';
+    var frame;
+
+    function test_eventsource(opts) {
+      return new Promise(function(resolve, reject) {
+        var eventSource = new frame.contentWindow.EventSource(scope, opts);
+        eventSource.addEventListener('message', function(msg) {
+          eventSource.close();
+          try {
+            var data = JSON.parse(msg.data);
+            assert_equals(data.mode, 'cors',
+                          'EventSource should make CORS requests.');
+            assert_equals(data.cache, 'no-store',
+                          'EventSource should bypass the http cache.');
+            var expectedCredentials = opts.withCredentials ? 'include'
+                                                           : 'same-origin';
+            assert_equals(data.credentials, expectedCredentials,
+                          'EventSource should pass correct credentials mode.');
+            resolve();
+          } catch (e) {
+            reject(e);
+          }
+        });
+        eventSource.addEventListener('error', function(e) {
+          eventSource.close();
+          reject('The EventSource fired an error event.');
+        });
+      });
+    }
+
+    service_worker_unregister_and_register(t, worker, scope)
+      .then(function(reg) {
+          return wait_for_state(t, reg.installing, 'activated');
+        })
+      .then(function() { return with_iframe(scope); })
+      .then(function(f) {
+          frame = f;
+          return test_eventsource({ withCredentials: false });
+        })
+      .then(function() {
+          return test_eventsource({ withCredentials: true });
+        })
+      .then(function() {
+          frame.remove();
+          return service_worker_unregister_and_done(t, scope);
+        })
+      .catch(unreached_rejection(t));
+  }, 'Service Worker should intercept EventSource');
+
 </script>
 </body>

testing/web-platform/tests/service-workers/service-worker/resources/fetch-event-test-worker.js

@@ -95,6 +95,22 @@ function handleCache(event) {
   event.respondWith(new Response(event.request.cache));
 }
 
+function handleEventSource(event) {
+  if (event.request.mode === 'navigate') {
+    return;
+  }
+  var data = {
+    mode: event.request.mode,
+    cache: event.request.cache,
+    credentials: event.request.credentials
+  };
+  var body = 'data:' + JSON.stringify(data) + '\n\n';
+  event.respondWith(new Response(body, {
+      headers: { 'Content-Type': 'text/event-stream' }
+    }
+  ));
+}
+
 self.addEventListener('fetch', function(event) {
     var url = event.request.url;
     var handlers = [
@@ -112,6 +128,7 @@ self.addEventListener('fetch', function(event) {
       { pattern: '?used-check', fn: handleUsedCheck },
       { pattern: '?fragment-check', fn: handleFragmentCheck },
       { pattern: '?cache', fn: handleCache },
+      { pattern: '?eventsource', fn: handleEventSource },
     ];
 
     var handler = null;